Use of dynamical coupling for improved quantum state transfer
Andriy O. Lyakhov, Christoph Bruder · Physical Review B · 2006
We propose a method to improve quantum state transfer in transmission lines. The idea is to localize the information on the last qubit of a transmission line by dynamically varying the coupling constants between the first and the last pair of qubits. The fidelity of state transfer is higher then in a chain with fixed coupling constants. The effect is stable against small fluctuations in the system parameters.